This guide is pinned up by my desk. I find it displays all the information I need in order to plan the garden. Forget websites, forget databases, forget apps. At the very least it is a reminder that daily temperatures lag behind day length, a little, and that they lag behind frost dates by a good two months. I've identified the key crop varieties, and made some sort of an attempt to document when they should be planted and how long they take to mature. Of course maturation dates are difficult to predict. They can vary so much dependant upon variety and microclimate.